Mode of operating window-sash



UNITED STATES PATENT OFFICE.

JOHN C. GRANT, OF SALEM, MASSACHUSETTS.

MODE 0F OPERATING WINDOW-SASH.

Speccaton of Letters Patent No. 18,200, dated September 15, 1857.

l'o all whom it may concern.'

Be it known that I, JOHN C. GRANT, of Salem, in the county of Essex andState of Massachusetts, have invented an Improvement in Raising andLowering Window- Sash, and that the following is a full, clear, andexact description of the principle or character which distinguishes itfrom all other things before shown and of the usual manner of making,modifying, and using the same, reference being had to the annexeddrawings, of which- Figure l shows a front elevation of framing and t-hemanner of hanging the sash. Figs. 2 and 3 are two views of the gearing.

My invent-ion consists in an improvement for holding window sashes atany desired point of elevation, dispensing with the use of weights andcords and their attending difliculties, for balancing the sashes, ashere in described.

Fig. l represents the frame A, window sash B and the arrangement forbalancing the sash, in section, and is described as follows. The plate Cis screwed into the frame A flush with its inner surface and has fourprojecting pieces a, a, a, a extending out from it which are bracedtogether by the two cross braces b, and the oblique side plates c, c.These plates serve for bearings for the cone pulley CZ and gear wheel dand pulley el. The pulley d has one end of a cord e fixed to it which iswound in the spiral slot f (seen in Fig. 2) on the cone pulley CZ whichis made larger than the pulley c both pulleys having flanges on theirends to prevent the cord from running off the ends. A smaller pulley gis provided on the end of the pulley (Z around which is coiled a springh. One end of the spring being fastened to this pulley the other end iscarried over and secured to the cross brace Z9. The gear wheel al meshesinto gear wheel lo which turns loosely on the shaft of the cone pulleyd. The teeth of this pulley pass through a small slot in the plate C,shown clearly in Figs. l and 3 and take into the rack z' which rack issecured in a groove in the side bar of the window sash and extends t-hewhole length of the sash. The pulleys, gear wheels and spring areinserted together in a recess E mortised in the frame A, and are securedthere by the plate C, as above described. As the window is raised orlowered the rack operates the loose gear wheel 70 and this wheeloperates the wheel d which is fixed to the pulley d and winds up thecord e around this pulley which unwinds it from t-he larger pulley (lthis, turning slower than the pulley cl winds up the spring which tendsto force the window up. By properly adjusting the spring to the weightof the window it will exert just sufficient strength to sust-ain it atany point of elevation to which it may be placed. By making the gearwheel 7: turn loose on its shaft and the cone pulley d larger than thepulley c I can make a very short spring answer for a long sash. Thismode of sustaining the sash is simple, durable,more economical thanweights and cords, and is very accessible in case of the derangement ofany of the parts, which is not the case with the commonly used weightsand cords.

I do not claim balancing the sash by means of a spring as that is notnew. But

That I do claim is- Combining with the window frame and sash the rack a,gears Z), o pulleys c, c and spring (Z all arranged and operatingsubstantially as herein above set forth.

JOHN C. GRANT.

Witnesses:

JOSEPH HALE, BENJ. A. GRAY.

